/Engine/Plugins/Runtime/Metasound/Source/MetasoundEngine/Public/MetasoundBuilderSubsystem.h
Returns whether or not live updates are both globally enabled (via cvar) and are enabled on this builder's last built sound, which may or may not still be playing.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Audio|MetaSound|Builder") bool GetLiveUpdatesEnabled() const